are rising fastest, among them states where housing was hardest hit, nevada, california, florida and michigan. >> hi, david. >> reporter: in ann arbor the evangelista family gave us a tour of their newly built home. >> this is my absolute favorite spot. >> reporter: another bright spot, the nation's biggest home builder, toll brothers, reporting tonight orders rising sharply. the evangelistas' home is one of them, and tonight they told us the number one reason why. >> the mortgage rates were so low, it was the best buy. it's a steal. >> reporter: a steal, he says. behind it, dynamics and historic lows for mortgage rates, and homeowners beginning to put their homes on the market. a low inventory and right now much of the country dealing with rock bottom prices. diane, i was reading today in orlando alone, inventory at seven-year lows, home owners begin to come back on the market, good news because there are buyers waiting for their homes. >> great news and on that hard-hit street, what a turnaround. >> great to go back. >> thanks, david. >>> now, from the hot housing market to the heat, period